I will show that all mathematical conclusions within Kepler’s third law of planetary motion can be
derived from the cube root of orbit periods. The inverse of the cube root determines planetary velocity.
The square of the cube root determines the orbit radius. I will use third law calculations to show that
any change of velocity has a cubic effect on the duration of an orbit. I offer speculation
regarding Kepler’s belief that planetary orbits are propelled by the Sun.
Uploaded by Bingston on